The Fremeau Efficiency Index (FEI) is a college football rating system based on opponent-adjusted drive efficiency. Approximately 20,000 possessions are contested annually in FBS vs. FBS games. First-half clock-kills and end-of-game garbage drives and scores are filtered out. Unadjusted game efficiency (GE) is a measure of net success on non-garbage possessions, and opponent adjustments are calculated with special emphasis placed on quality performances against good teams, win or lose.

Overall SOS ratings represent the likelihood than an elite team (two standard deviations better than average) would go undefeated against the given team's entire schedule. The table below also includes each team's record against opponent FEI ranking categories -- E for Elite (ranked 1-5), VG for Very Good (ranked 6-15), G for Good (ranked 16-30), AA for Above Average (ranked 31-50), Av for Average (ranked 51-70), BA for Below Average (ranked 71-90), B for Bad (ranked 91-105), VB for Very Bad (ranked 106-115), and Aw for Awful (ranked 116 or worse).